I first stumbled upon time complexity concept 3 years ago in 2020. I spent 1 hour devouring the materials on Wikipedia but had no clue what it is.
3 years later, after watching the solutions of 5 Leetcode questions, I realised that I have to learn and understand more about time complexity and the Big O notation.
It took me one week to take action and I finally understood a little more through these YouTube shorts:
Further Readings:
https://www.freecodecamp.org/news/big-o-notation-why-it-matters-and-why-it-doesnt-1674cfa8a23c/